Lecture 10 - Nitrogen (N) Phosphorous (P) Sulfur (S)-Table...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 10 (9/10/10) Global Ocean Currents - Ocean currents created by moving air mass & modified by the Coriolois effect and the shape & location of continental land masses - Figure 3-3 Biogeochemical cycles - A biogeochemical cycle refers to the cycling of matter within & among the four spheres of the environment - Scientists focus on the cycling of both individual elements (e.g. nitrogen, carbon) & compounds (e.g. water, rock) - Major features of biogeochemical cycles: Different reservoirs Number of connecting pathways Variation in rates of cycling Sensitivity to human activities Cycling of Key Elements - The 6 most important biogeochemical cycles are those that involve the essential elements that comprise the majority of atoms in living things Oxygen (O) Carbon (C) Hydrogen (H)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Nitrogen (N) Phosphorous (P) Sulfur (S)-Table 3-6 & figure 3-29 Different elements cycle at different rates-Rate depends upon chemical reactivity Higher the reactivity, the faster the cycling The Carbon Cycle-Carbon is withdrawn from the atmosphere by photosynthesis: CO2 +H2O + energy = CH2O =O2-Carbon is returned to the atmosphere by combustion (burning fuel & by respiration) : CH2O + O2 =CO2 +H2O +energy-Figure 3.25 & 3.27a Human Impact-Many biogeochemical cycles are being accelerated, causing both depletion of resources and pollution-Carbon is a major. Phosphorous Cycle-Rate depends upon chemical reactivity Higher the reactivity, the faster the cycling-Existence of a gas phase No gas phase, very slow cycling e.g Phosphorous-Figure 3-30...
View Full Document

This document was uploaded on 02/01/2011.

Page1 / 2

Lecture 10 - Nitrogen (N) Phosphorous (P) Sulfur (S)-Table...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online